.global _start

_start:

    ;  使能所有外设时钟

    ; CCGR0 
    ldr r0, =0x020c4068
    ldr r1, =0xffffffff
    str r1,[r0]

    ldr r0, =0x020c406c
    str r1,[r0]
    
    ldr r0, =0x020c406c
    str r1,[r0]
    
    ldr r0, =0x020c406c
    str r1,[r0]
    
    ldr r0, =0x020c406c
    str r1,[r0]
    
    ldr r0, =0x020c406c
    str r1,[r0]
    
    ldr r0, =0x020c406c
    str r1,[r0]

